Skip non existing directory in gclient recurse

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8094008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@103525 0039d316-1c4b-4281-b951-d872f2087c98

gclient.py

@@ -1095,7 +1095,10 @@ def CMDrecurse(parser, args):
       env['GCLIENT_SCM'] = scm
     if url:
       env['GCLIENT_URL'] = url
+    if os.path.isdir(cwd):
       subprocess2.call(args, cwd=cwd, env=env)
+    else:
+      print >> sys.stderr, 'Skipped missing %s' % cwd
   return 0